發(fā)布時間：2018-02-24 03:37

  本文關(guān)鍵詞： 致密油藏 滲透率應(yīng)力敏感 壓裂水平井 穩(wěn)態(tài)產(chǎn)能 非穩(wěn)態(tài)產(chǎn)能　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：致密油藏由于滲透率低,采用直井開發(fā)致密油藏一般無自然產(chǎn)能,因此常采用壓裂水平井對致密油藏進(jìn)行開發(fā)。為了提高水平井壓裂施工參數(shù)設(shè)計(jì)的準(zhǔn)確性,提高開發(fā)效益,需要對壓裂水平井產(chǎn)能模型進(jìn)行研究。以鄂爾多斯盆地某致密油藏為研究對象,通過室內(nèi)巖心實(shí)驗(yàn)、流態(tài)特征識別和理論模型建立等方法,對致密油藏的壓裂水平井的產(chǎn)能預(yù)測和影響因素分析優(yōu)化等方面進(jìn)行了研究,完成了以下工作并取得了一些認(rèn)識:(1)開展了地層條件下的應(yīng)力敏感實(shí)驗(yàn),得到的H井區(qū)、J井區(qū)、L井區(qū)和W井區(qū)基質(zhì)巖樣的指數(shù)式平均應(yīng)力敏感系數(shù)分別為0.0073MPa-1、0.0205MPa-1、0.0244MPa-1和0.01e3MPa-1,證明致密油藏存在滲透率應(yīng)力敏感性。(2)以保角變換法和疊加原理為基礎(chǔ),推導(dǎo)了考慮應(yīng)力敏感的致密油藏壓裂水平井穩(wěn)態(tài)產(chǎn)能模型,進(jìn)行了實(shí)例計(jì)算,并與其它經(jīng)典的壓裂水平井穩(wěn)態(tài)產(chǎn)能公式的計(jì)算結(jié)果進(jìn)行了比較。結(jié)果表明,由于考慮了滲透率應(yīng)力敏感,本文推導(dǎo)的穩(wěn)態(tài)產(chǎn)能模型與其它模型相比誤差更小,精度更高。(3)利用推導(dǎo)的穩(wěn)態(tài)產(chǎn)能模型,分析了裂縫條數(shù)、裂縫長度、裂縫導(dǎo)流能力和滲透率應(yīng)力敏感系數(shù)對壓裂水平井產(chǎn)能的影響。其中,日產(chǎn)油量隨著裂縫條數(shù)的增加而增加,但增加幅度隨著裂縫條數(shù)的增加而減少;日產(chǎn)油量隨著裂縫長度的增加而增加,增加幅度基本呈線性;壓裂水平井的產(chǎn)量隨裂縫導(dǎo)流能力的增加而增加,但增加幅度減小,在同一裂縫導(dǎo)流能力情況下,隨著裂縫長度的增加,壓裂水平井的產(chǎn)能也增加;隨著應(yīng)力敏感系數(shù)的增大,同一壓差下的壓裂水平井產(chǎn)能下降幅度也增大,增大壓差所造成的產(chǎn)能降幅也越大,所以應(yīng)保持合理的生產(chǎn)壓差。(4)壓裂水平井滲流過程中會出現(xiàn)相應(yīng)的流態(tài),用流態(tài)特征識別的方法分析了壓裂水平井生產(chǎn)過程中的流態(tài)特征,根據(jù)流態(tài)特征建立了相應(yīng)的產(chǎn)能方程,耦合后得到了考慮應(yīng)力敏感的致密油藏壓裂水平井非穩(wěn)態(tài)產(chǎn)能預(yù)測模型。(5)利用推導(dǎo)的非穩(wěn)態(tài)產(chǎn)能模型,對致密油藏四個井區(qū)的每類儲層各設(shè)計(jì)了一口壓裂水平井進(jìn)行產(chǎn)能影響因素優(yōu)化,得到了各參數(shù)的優(yōu)化值。分析了應(yīng)力敏感對壓裂水平井產(chǎn)能的影響,當(dāng)定井底壓力生產(chǎn),應(yīng)力敏感系數(shù)的變化僅造成壓裂水平井相對產(chǎn)量的高低,對壓裂水平井產(chǎn)量的遞減趨勢并無影響。本文的研究成果為致密油藏壓裂水平井的產(chǎn)能預(yù)測、工作制度的確定和壓裂施工參數(shù)設(shè)計(jì)提供了參考。
[Abstract]:Because of the low permeability of tight reservoir, the development of tight reservoir by using straight well has no natural productivity, so fracturing horizontal well is often used to develop the tight reservoir, in order to improve the accuracy of fracturing operation parameter design of horizontal well and improve the benefit of development. It is necessary to study the productivity model of fracturing horizontal well. Taking a tight reservoir in Ordos Basin as the research object, through laboratory core experiments, the identification of flow characteristics and the establishment of theoretical model, etc. In this paper, the productivity prediction of fractured horizontal wells in tight reservoirs and the analysis and optimization of influencing factors are studied. The following works have been accomplished and some understandings have been obtained. (1) Stress-sensitive experiments under formation conditions have been carried out. The exponential average stress sensitivity coefficients of the matrix rock samples obtained from the He-J well area and the W well area are 0.0073 MPa-1 and 0.0205MPa-1 0.0244MPa-1 and 0.01e3MPa-1, respectively. It is proved that the permeability stress sensitivity of tight reservoirs is based on the conformal transformation method and the principle of superposition. The steady-state productivity model of fractured horizontal wells in tight reservoir considering stress sensitivity is derived, and a practical example is calculated. The results are compared with those of other classical formulas for calculating the steady-state productivity of fracturing horizontal wells. The results show that, Considering permeability stress sensitivity, the steady-state productivity model derived in this paper has smaller error and higher precision than other models. (3) by using the derived steady-state productivity model, the fracture number and fracture length are analyzed. The effect of fracture conductivity and permeability stress sensitivity coefficient on the productivity of fractured horizontal wells, in which the daily oil production increases with the increase of the number of fractures, but the increasing range decreases with the increase of the number of fractures. The daily oil production increases with the increase of fracture length, and increases linearly, while the production of fractured horizontal wells increases with the increase of fracture conductivity, but the increase decreases, under the condition of the same fracture conductivity, the daily oil production increases with the increase of fracture length, and the oil production increases linearly with the increase of fracture conductivity. With the increase of fracture length, the productivity of the fractured horizontal well also increases, and with the increase of the stress sensitivity coefficient, the productivity of the fractured horizontal well under the same pressure difference increases, and the greater the pressure difference, the greater the productivity decrease. Therefore, it is necessary to maintain a reasonable production pressure difference. 4) the corresponding flow state will appear in the percolation process of the fractured horizontal well, and the characteristics of the flow state in the production process of the fracturing horizontal well are analyzed by the method of identifying the flow state characteristics. According to the characteristics of flow state, the corresponding productivity equation is established, and the unsteady productivity prediction model of fractured horizontal wells considering stress sensitivity is obtained by coupling. A fracturing horizontal well is designed for each type of reservoir in four well areas of dense reservoir to optimize the productivity factors, and the optimized values of each parameter are obtained. The effect of stress sensitivity on the productivity of fractured horizontal well is analyzed. The change of stress sensitivity coefficient only causes the relative production of fractured horizontal wells, and has no effect on the decline trend of fracturing horizontal wells. The research result of this paper is the prediction of productivity of fractured horizontal wells in dense reservoirs. The determination of working system and the design of fracturing operation parameters provide reference.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE328

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